Igeo | Igeo classes | Pollution intensity |
<0 | 0 | Unpolluted |
0 - 1 | 1 | Unpolluted to moderately polluted |
1 - 2 | 2 | Moderately polluted |
2 - 3 | 3 | Moderately to strongly polluted |
3 - 4 | 4 | Strongly polluted |
4 - 5 | 5 | Strongly to very strongly polluted |
>5 | 6 | Very strongly polluted |